<div class="widget-wrapper">
    <div class="mdui-hidden-md-up" style="height: 15px"></div>
    <div class="widget" id="fixed">
        <?php if (is_singular(array('post', 'page'))): ?>
        <div id="mulu-1" class="mdui-panel-item mdui-panel-item-open widget_mulu">
            <div class="mdui-panel-item-header">文章目录<i class="line"></i></div>
            <div class="mdui-panel-item-body">
                <?php echo article_index(); ?>
            </div>
        </div>
        <?php endif;?>
        <?php dynamic_sidebar('widget_default');?>
    </div>
</div>